1329results about How to "Reduce polarization" patented technology

A mode-locked laser with intracavity frequency conversion is disclosed. In one embodiment the conversion frequency is improved by reducing the temporal, spatial, or polarization overlap between pulses at the fundamental frequency and pulses at a frequency-shifted frequency.

A dimensionally stable, highly resilient, hybrid copolymer solid-solution electrolyte-retention film for use in a lithium ion battery in one preferred embodiment has a predominantly amorphous structure and mechanical strength despite contact with liquid solvent electrolyte. The film is a thinned (stretched), cast film of a homogeneous blend of two or more polymers, one of which is selected for its pronounced solvent retention properties. A very high surface area inorganic filler dispersed in the blend during formation thereof serves to increase the porosity of the film and thereby enhance electrolyte retention. The film is soaked in a solution of liquid polymer with liquid organic solvent electrolyte and lithium salt, for absorption thereof. Use of a cross-linked liquid polymer enhances trapping of molecules of the electrolyte into pores of the film. The electrolyte film is sandwiched between flexible active anode and cathode layers to form the lithium ion battery. Novel methods are provided for forming the electrodes, the polymer substrate, and other elements of the battery.

A semiconductor storage device includes: a first conductive adhesive layer selectively formed over a semiconductor substrate; an insulating film formed on the semiconductor substrate to cover the first conductive adhesive layer and having an opening exposing a central part of the first conductive adhesive layer; and a capacitive element including a bottom electrode formed along a bottom surface and a wall surface of the opening, a capacitive insulating film formed on the bottom electrode, and a top electrode formed on the capacitive insulating film. The first conductive adhesive layer is in contact with the bottom electrode only at a bottom surface part of the opening which includes a corner where the bottom surface of the opening meets the wall surface thereof.

Preferred aspects of the present invention relate to advances in rotating, vortex-enhanced reverse osmosis filtration. More particularly, the filtration device and methods incorporate a rotational drive mechanism adapted to use the flow of pressurized process fluid to cause rotation of a rotor within a housing, thereby creating shear and Taylor vortices in the gap between the rotor and housing. The improvements disclosed herein facilitate continuous use of vortex-enhanced filtration for prolonged periods of time.

A method and system to measure misalignment error between two overlying or interlaced periodic structures are proposed. The overlying or interlaced periodic structures are illuminated by incident radiation, and the diffracted radiation of the incident radiation by the overlying or interlaced periodic structures are detected to provide an output signal. The misalignment between the overlying or interlaced periodic structures may then be determined from the output signal.

A device for achieving multi-photon interference, said device comprising: at least two solid state photon emitters, each solid state photon emitter comprising nuclear and electron spin states coupled together, each solid state photon emitter being configured to produce photon emission comprising a photon emission peak, wherein the photon emission peaks from different solid state photon emitters have a first frequency difference between peak intensities, and wherein the electron spin states of each solid state photon emitter are resolvable; an excitation arrangement configured to individually address the at least two solid state photon emitters; a plurality of optical out coupling structures wherein each solid state photon emitter is provided with an associated optical out coupling structure; a tuning arrangement configured to reduce the first frequency difference between the peak intensities of the photon emission peaks from the at least two solid state photon emitters to a second frequency difference which is smaller than the first frequency difference; a photon interference arrangement configured to overlap photon emissions from the at least two solid state emitters after tuning; and a detector arrangement configured to detect photon emissions from the at least two solid state emitters after tuning and passing through the photon interference arrangement, wherein the detector arrangement is configured to resolve sufficiently small differences in photon detection times that tuned photon emissions from the at least two solid state emitters are quantum mechanically indistinguishable resulting in quantum interference between indistinguishable photon emissions from different solid state photon emitters.

The invention provides permeable magnetically responsive filtration membranes that include a filtration membrane polymer base suitable for fluid filtration; hydrophilic polymers conjugated to the surface of the filtration membrane polymer; and magnetic nanoparticles affixed to the ends of a plurality of the hydrophilic polymers, wherein the hydrophilic polymers are movable with respect to the surface of the filtration membrane polymer surface in the presence of an oscillating magnetic field.

The present invention discloses an organic phase dual flow battery, which comprises at least a battery monomer, wherein the battery monomer comprises a positive electrode and a negative electrode, the positive electrode and the negative electrode are respectively connected with a positive electrode terminal and a negative electrode terminal, a separation membrane is arranged between the positive electrode and the negative electrode, a positive electrode flow channel is arranged between the separation membrane and the positive electrode, a negative electrode flow channel is arranged between the separation membrane and the negative electrode, the positive electrode flow channel is filled with a positive electrode electrolyte liquid, the negative electrode flow channel is filled with a negative electrode electrolyte liquid, both ends of the positive electrode flow channel are respectively communicated with a positive electrode electrolyte liquid storage tank, both ends of the negative electrode flow channel are respectively communicated with a negative electrode electrolyte liquid storage tank, an active substance of the positive electrode electrolyte liquid is ferrocene or a derivative thereof, and an active substance of the negative electrode electrolyte liquid is anthraquinone or a derivative thereof. The organic phase dual flow battery of the anthraquinone or the derivative thereof / the ferrocene or the derivative thereof has advantages of simple manufacturing process, low cost, high cycle life and the like, has characteristics of high energy density, high power density and high energy utilization efficiency, and can be widely used in electric power, transportation, electronics and other industries.

The invention discloses a modified composite material containing silicon-base material, a preparation method thereof, and an application thereof in a lithium ion battery. The composite material includes a silicon-base core and a modifying layer covering same. The modifying layer includes a polymer covering film and a nano-conductive material embedded therein. The modified composite material not only can isolate an electrolyte to inhibit side reactions of the electrolyte on the surface of the material, thus improving overall performance of the battery, but also can improve electric conductivityand improve structural stability due to the unique structure by embedding the nano-conductive material in the polymer. Tension is absorbed by means of deformation, so that problems of breaking and pulverization and stripping of the electrode during processing and use of the silicon-base negative material are solved. The problems of pulverization and stripping of the electrode due to large expansion during charge / discharge processes of the silicon-base material are solved, thus stabilizing the structure of the electrode and improving cycle performance of the cell.

Filtration systems (40) utilize a pre-treatment method to cause scale formation to occur on particles (94) in the fluid stream (96) rather than on the filter surface and may also destroy microorganisms in the fluid stream. More specifically, but not limited to, a filtration device can be a filtration membrane, such as spiral wound filtration membrane (60), that utilizes an open feed spacer (80), such for example an embossed or printed pattern on the membrane, to create a thin feed spacer channel which replaces a conventional feed spacer mesh material. System (40) further utilizes a treatment device (54) to enable a pulsed power, magnetic, electro-magnetic, electro-static, or hydrodynamic fluid treatment scheme to condition particles in the fluid stream (96) such that scale forming elements precipitate (94) on to the particles in the fluid stream rather than on the filtration surfaces.

The invention discloses a modified composite material containing a silicon base material, which comprises a silicon base core and a polymer cladding layer covering the surface of the core, and a preparation method and use thereof in a lithium ion battery. The method comprises the steps of : 1) adding a polymer into a liquid solvent and dispersing to obtain a slurry; 2) adding a silicon-based material or a mixture of that silicon-based material and the carbon material into the slurry and mixing the solid and liquid; 3) removing the solvent to obtain a modified composite material containing a silicon-based material. As the polymer coat layer is introduced on the surface of the silicon base core, so that the electrolyte can be isolated and the side reaction of the electrolyte on the surface of the silicon base core can be prevented; the method can also improve the crushing, electrode pulverization and peeling of the silicon-based negative electrode material in the process of processing and using, and reduce the electrode crushing and peeling caused by the huge volume expansion of the silicon-based material in the process of charging and discharging, so as to achieve the purpose of stabilizing the electrode structure and improving the cell cycle performance.

A nitride semiconductor device includes a semiconductor stacked structure which is formed of a nitride semiconductor having a first principal surface and a second principal surface opposed to the first principal surface and which includes an active layer. The first principal surface of the semiconductor stacked structure is formed with a plurality of indentations whose plane orientations are the {0001} plane, and the plane orientation of the second principal surface is the {1-101} plane. The active layer is formed along the {1-101} plane.

A semiconductor laser module has a semiconductor laser device; a package for housing the semiconductor laser device; a PBC fixed in the package for polarization-synthesizing two laser beams output from the semiconductor laser device; a depolarizing element fixed in the package for depolarizing a synthesizing light output from the PBC; and an optical fiber for receiving a light output from the depolarizing element.

The invention discloses a three-dimensional porous silicon-based composite negative electrode material of a lithium ion cell and a preparation method thereof. A collection body material, such as a copper foil net or a copper wire net or foam copper or foam nickel, which has a three-dimensional net structure, enables electrode active substances to be uniformly dispersed in the material and the surface of the material, and has high temperature resistant characteristic and excellent conductivity, is adopted; and a sizing material containing simple substance silicon or a mixture of simple substance silicon and metal M is combined with the copper foil net or copper wire net or foam copper or foam nickel by a dipping method, and then the three-dimensional porous silicon-based composite negative electrode material is formed by a heat treatment (alloying and annealing treatment) manner. According to the invention, based on the three-dimensional porous structure, the forming of silicon metal alloy as well as excellent binding force between the negative electrode material and the three-dimensional porous collection body material, the cell prepared from the porous silicon-based composite negative electrode material has higher discharge specific capacity and first charge-discharge efficiency and excellent cycle performance.

The invention discloses an electrolyte for a lithium manganese battery, which comprises a non-aqueous organic solvent, lithium salt, a film forming additive, an anti-overcharge additive and a stabilizing additive, and also comprises the following components by weight percent: 0.1-5% of unsaturated sultone as a high temperature additive and 0.01-1% of fluorocarbon surfactant. Based on the reasonable deign of each component, the electrolyte is added with the novel high-temperature additive and the fluorocarbon surfactant, so that the lithium manganese battery using the electrolyte has excellent cycle life and high temperature properties.

The invention discloses a preparation method of a metal doped lithium manganese phosphate / graphene / carbon composite material. By adopting the method, the graphene is added in the preparation process of the lithium manganese phosphate to replace partial conductive carbon black; and a precursor which is a mixture of three solutions is transferred to a reaction tank and is subjected to solvothermal reaction at 160-300 DEG C for 1-20 hours to obtain the graphene in-situ composite lithium manganese phosphate material. According to the preparation method disclosed by the invention, the surface-contact compounding of graphene and lithium manganese phosphate is achieved by taking advantage of the flexibility characteristic of graphene, and the electronic conductivity of the lithium manganese phosphate is improved by taking advantage of the extremely high conductivity of graphene. By adopting the preparation method disclosed by the invention, not only is the intrinsic electronic conductivity of the composite material improved, but also a graphene film layer with extremely high conductivity is uniformly coated on the surface of the lithium manganese phosphate material, the graphene and the conductive carbon black together form a three-dimensional conductive network, and therefore the electrochemical performance of the lithium manganese phosphate material is obviously improved, and the composite material can be used as the anode material of a lithium ion battery.

The invention belonging to the technical field of lithium ion cells, and particularly relates to a method for improving hardness of a lithium ion cell by rapid formation. In the method, by adjusting the pre-baking time and temperature and the formation temperature of an electric core as well as the surface pressure on an electric core main body, the purpose of reducing the electric core polarization is achieved, high-current rapid formation is further realized, and finally the formation stopping potential is adjusted, so as to prepare the lithium ion cell with higher hardness. As compared with the prior art, the method has the following advantages: the high-temperature cramping and baking reshaping after formation is cancelled, so that the prepared electric core is higher in capacity; the electric core bears constant (or variable) pressure during the charge and discharge processes, thus the polarization in the charge and discharge processes is lower, and the capacity consistency of the prepared electric core is better; and because different temperatures and an SOC (state of charge) stopping manner are adopted for formation, the prepared electric core not only has excellent performance, but also has higher hardness.

Electrical medical leads having active fixation electrodes, particularly helix electrodes intended to be screwed into body tissue, e.g., the heart, are disclosed having selectively applied insulation to optimize exposed electrode surface area and dispose the exposed electrode surface area toward tissue that is less traumatized by injury caused by screwing in the fixation helix. In a preferred fabrication method, an outer helical surface is masked by contact with a masking tube while a dielectric coating is applied to the inner helical surface of the coil turns of the helix, and the masking tube is removed when the dielectric coating has set. In one variation, at least one aperture is formed through the masking tube sidewall exposing an area of the outer helical surface thereby interrupting the uninsulated outer helical electrode.

The button-type electrochemical capacitor comprises: a button-type anode cover and a button-type cathode cover, and the button-type anode cover is tightly coupled to the button-type cathode cover; inside the button-type anode cover and the button-type cathode cover, there are anode piece, cathode piece, multi-pore isolator and electrolyte; the anode piece is made by means of coating the anode active materials on the anode current collector; the cathode piece is made by means of coating the cathode active materials on the negative current collector; the anode piece is connected to the button-type anode cover; the cathode piece is connected to the button-type cathode cover; said anode piece, multi-pore isolator film and the cathode piece are winded together to form a square coil core.

The invention discloses a pre-lithiated and graphene-coated mesoporous SiO negative electrode material and a preparation method thereof. The method comprises the following steps: firstly, adding metal lithium to a non-aqueous solvent to form a lithium solution; secondly, adding graphene oxide to a dispersing solvent and carrying out ultrasonic treatment to obtain 0.5-60g / L of graphene oxide dispersion; adding nano mesoporous SiO microspheres with the specific surface area of 500-700m<2> / g to the dispersion, and carrying out ultrasonic treatment; adding the lithium solution under a stirring condition; adding a lithium complexing agent, stirring, filtering and washing to obtain a precursor; and finally drying the precursor in vacuum, grinding evenly, packing into a corundum boat, sintering in an inert atmosphere furnace, and cooling along with the furnace, so as to obtain the pre-lithiated and graphene-coated mesoporous SiO negative electrode material. The composite material is prelithiated in the process of preparing the graphene-coated mesoporous SiO negative electrode material; and the initial Coulomb efficiency, the cycle performance and the charge and discharge specific capacity of a silicon oxide negative electrode material are improved.

The invention discloses a conductive agent dispersion liquid and a preparation method thereof. The conductive agent dispersion liquid contains a conductive agent, a solvent and a dispersion agent, wherein the dispersion agent contains aromatic rings and can be bound with the surface of the conductive agent by Van der Waals force among molecules and pi-pi action force between planes; and the solubility in the first solvent at the temperature of 25 DEG C is not smaller than 10wt%. The invention also discloses an electrode slurry and a preparation method thereof, and a battery electrode prepared from the electrode slurry and a battery. As using the matter which contains the aromatic rings and can be bound with the surface of the conductive agent by Van der Waals force among molecules and pi-pi action force between planes as the dispersion agent of the conductive agent, the battery capacitance, the charging and discharging capacitance and the rate discharge property are effectively enhanced.

A liquid crystal display apparatus including one pair of substrates, at least one of said substrates being transparent, one pair of polarizing plates arranged on the paired substrates respectively, a liquid crystal layer sandwiched by the paired substrates, a liquid crystal display panel in which an electrode group is formed on at least one of the paired substrates and is to apply an electric field to the liquid crystal layer, and a light source unit arranged on a rear surface of the liquid crystal display panel, a monoaxial absorption anisotropic layer provided between the paired polarizing plates. In such apparatus, a high contrast ratio can be achieved due to suppression of black luminance. Also, better display qualities can be achieved by reducing a blue changing phenomenon of black representation.

The invention discloses a preparation method of a sodium-ion battery cathode material Na3V2(PO4)3. The method comprises the following steps: (1) mixing a sodium salt, a vandic salt, phosphate, a complexing agent, a high-molecular compound and a solvent to obtain a Na3V2(PO4)3 spinning solution; (2) carrying out electrostatic spinning on the Na3V2(PO4)3 spinning solution to obtain a Na3V2(PO4)3 spinning precursor; and (3) collecting the Na3V2(PO4)3 spinning precursor, carrying out thermal treatment on the Na3V2(PO4)3 spinning precursor in an inert atmosphere and cooling the Na3V2(PO4)3 spinning precursor to obtain the sodium-ion battery cathode material Na3V2(PO4)3. According to the sodium-ion battery cathode material Na3V2(PO4)3 prepared by the method disclosed by the invention, high-capacity charging and discharging of the battery can be realized; and the cycle stability of the battery can be improved.

The invention relates to the technical field of battery materials, in particular to a coupled carbon nano tube-graphene composite three-dimensional network structure-coated ternary material and a preparation method thereof. According to the coupled carbon nano tube-graphene composite three-dimensional network structure-coated ternary material, a nickel-cobalt-manganese ternary material, carbon nano tubes and graphene are taken as raw materials; and the ternary material is characterized by being prepared by the following steps: with polyvinyl pyrrolidone as a dispersing agent, through a liquid-phase self-assembling method, simultaneously connecting the graphene and the carbon nano tubes with a silane coupling agent to form a three-dimensional network structure; and evenly dispersing the coupled carbon nano tube-graphene composite material and the nickel-cobalt-manganese ternary material through a physical method, coating the surface of the nickel-cobalt-manganese ternary material, and sintering the nickel-cobalt-manganese ternary material in an inert atmosphere, so as to obtain the evenly coated product. The product provided by the invention has the advantages of high specific discharge capacity, long cycle life and simplicity in preparation process; and large-scale production is easy to realize.

A microstrip reflectarray antenna with a low cross polarization level is disclosed. The microstrip reflectarray antenna of the present invention comprises: a ground plate; a reflecting plate with an upper surface, and a plurality of microstrip antenna units locating on the upper surface; each of the microstrip antenna units consisting of an inner ring and an outer ring; a plurality of supporting units for supporting the reflecting plate above the ground plate; and a signal transmitting unit locating above the reflecting plate for transmitting and receiving the high frequency signal. Besides, the size of the outer ring corresponds to its location on the upper surface of the reflecting plate, and there is a predetermined ratio between the diameter of the outer ring and the diameter of the inner ring, and both of the outer ring and the inner ring respectively have at least one slot.

The microwave synthesis process of carbon coated lithium iron phosphate as the composite positive electrode material for lithium ion cell includes the following steps: mixing material of lithium salt, organic ferrite, phosphate radical containing material and organic carbon source as coating material in the stoichiometric ratio of Li, Fe, P and C of 1 to 1 to 1 to 0.2-2 via ball milling with ethanol or acetone as dispersant for 3-6 hr; drying the mixture; tabletting; setting into alumina crucible together with active carbon and heating in microwave oven for 5-12 min. The lithium salt material may be inorganic Li2CO3 or LiOH, or organic lithium acetate, lithium lactate, lithium oxalate, lithium citrate or lithium formate; and the phosphate radical containing material may be (NH4)2HPO4 or (NH4)H2PO4.